07-17-2011
Is there a particular reason you are after a relative metric? Why not look at absolute delay?
I mean, as you said before, the delay on a local box is super small, practically zero. If you'll try to calculate a quotient (remote delay)/(local delay), you'll get huge numbers, and very large inaccuracy.
An absolute measure of the delay would be a much more accurate one, in terms of numerical stability.
However, I believe the ping echoes are given lower priority than let's say, the data being transferred through ssh -X session, so ping need not be the same as your text editing delay, nevertheless, under normal network and processing load, it should come pretty close.
5 More Discussions You Might Find Interesting
1. Cybersecurity
Hello guys,
I'm actually working on my master thesis which has for subject the evaluation of virtual firewall in a cloud environment. To do so, I installed my own cloud using OpenNebula (as a frontend) and Xen (as a Node) on two different machines. The Xen machine is my virtual firewall thanks... (2 Replies)
Discussion started by: Slaughterman
2 Replies
2. UNIX for Dummies Questions & Answers
Hi
As a dummy my question is very simple. When typing cw I've read (many times) that a '$' should appear at the end of the word I'm about to change. However, it doesn't, and in my case the word is instantly deleted and so ready to be changed!
Can somebody tell me why this is, or maybe I... (4 Replies)
Discussion started by: joesh
4 Replies
3. AIX
Hi every one,
we have a set up in solaris 8 and 9 and running many cshell scripts.. we are migrate to AIX . Now, i want to know the latency difference between two boxes(Solaris and AIX). Kindly help me to , how to do Latency test.. (0 Replies)
Discussion started by: Madhu Siddula
0 Replies
4. Solaris
Hi every one,
we have a set up in solaris 8 and 9 and running many cshell scripts.. we are migrate to AIX . Now, i want to know the latency difference between two boxes(Solaris and AIX). Kindly help me to , how to do Latency test.. (2 Replies)
Discussion started by: Madhu Siddula
2 Replies
5. Red Hat
I have an application that routinely alloc() and realloc() gigabyte blocks of memory for image processing applications; specifically performing rotations of huge images, or creating/ deleting huge image buffers to contain multiple images. Immediately upon completion of an operation I call free() to... (9 Replies)
Discussion started by: imagtek
9 Replies
LEARN ABOUT CENTOS
hwloc_distances_s
hwloc_distances_s(3) Hardware Locality (hwloc) hwloc_distances_s(3)
NAME
hwloc_distances_s -
SYNOPSIS
#include <hwloc.h>
Data Fields
unsigned relative_depth
unsigned nbobjs
float * latency
float latency_max
float latency_base
Detailed Description
Distances between objects.
One object may contain a distance structure describing distances between all its descendants at a given relative depth. If the containing
object is the root object of the topology, then the distances are available for all objects in the machine.
If the latency pointer is not NULL, the pointed array contains memory latencies (non-zero values), as defined by the ACPI SLIT
specification.
In the future, some other types of distances may be considered. In these cases, latency may be NULL.
Field Documentation
float* hwloc_distances_s::latency
Matrix of latencies between objects, stored as a one-dimension array. May be NULL if the distances considered here are not latencies.
Values are normalized to get 1.0 as the minimal value in the matrix. Latency from i-th to j-th object is stored in slot i*nbobjs+j.
float hwloc_distances_s::latency_base
The multiplier that should be applied to latency matrix to retrieve the original OS-provided latencies. Usually 10 on Linux since ACPI SLIT
uses 10 for local latency.
float hwloc_distances_s::latency_max
The maximal value in the latency matrix.
unsigned hwloc_distances_s::nbobjs
Number of objects considered in the matrix. It is the number of descendant objects at relative_depth below the containing object. It
corresponds to the result of hwloc_get_nbobjs_inside_cpuset_by_depth.
unsigned hwloc_distances_s::relative_depth
Relative depth of the considered objects below the object containing this distance information.
Author
Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code.
Version 1.7 Sun Apr 7 2013 hwloc_distances_s(3)